Safety at Home: Injury Prevention and Firearm Safety
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Lifetime measurements in 146Ba and 146,148Ce using the fast-timing technique Faye Rowntree 24/04/2025 Faye Rowntree 1
The Lanthanides National Nuclear Data Centre (NNDC) Z=55 Z=55 N=82 N=82 150Cs 150Ba 150La 150Ce 150Pr 80.8ms 258ms 0.51s 6.05s 6.19s 148Cs 148 151ms 619ms 148Ba Ba 148La 148 619ms 1.411s 56.8s 148Ce Ce 148Pr 56.8s 2.29m 148Cs 146 322ms 2.16s 146Ba Ba 146La 146 2.16s 6.1s 13.22m 146Ce Ce 13.22m Faye Rowntree 2 24/04/2025
Octupole Deformation -previously seen in the neutron-rich actinides -separation of centre of mass and centre of charge -creates an enhanced dipole moment Gaffney, L., Butler, P., Scheck, M. et al, Nature 497, 199 204 (2013) Faye Rowntree 3 24/04/2025
Octupole Deformation Miniball Miniball (CERN) GRIFFIN GRIFFIN (TRIUMF) electric quadrupole moment (Q0) electric octupole moment (Q3) electric dipole moment (D0) Faye Rowntree 4 24/04/2025
Octupole Deformation R. Lica et al, Phys. Rev. C 97, 97, 024305 (2018) M. M. Satrazani, Thesis (2024) National Nuclear Data Centre (NNDC) Faye Rowntree 5 24/04/2025
Electric Dipole Moment M. M. Satrazani, Thesis (2024) R. Lica et al, Phys. Rev. C 97, 97, 024305 (2018) Nucleus Nucleus D D0 0shell shell / /efm 0.11 0.11 0.08 0.02 -0.04 -0.08 0.15 0.15 0.13 0.14 efm D D0 0macro macro / /efm 0.01 0.01 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.02 efm D D0 0 / /efm 0.12 0.13 0.09 0.04 0.02 -0.06 0.17 0.18 0.15 0.16 533 (1991) efm 140Ba 142Ba 144Ba 146 146Ba Ba 148 148Ce Ce 146Ba 148Ba 150Ba 144Ce 146Ce 148Ce 146Nd National Nuclear Data Centre (NNDC) P. A. Butler and W. Nazarewicz, Nuc. Phys. A 533 Faye Rowntree 6 24/04/2025
ISAC-I - RIB produced via isotope separation on-line (ISOL) technique (ISOL) - Protons hit UC target - Ions separated by mass - RIB sent to low energy beam transport (LEBT), then to switchboard - RIB delivered to GRIFFIN mass GRIFFIN Faye Rowntree 7 24/04/2025
GRIFFIN LaBr3(Ce) ZDS (usually) RIB hits tape RIB hits tape tape removes decay tape removes decay products products HPGe Tape Faye Rowntree 8 24/04/2025
Fast Timing feeder feeder feeder State of interest 2 signals start and stop decay decay decay Intermediate state of interest TAC spectrum gives information about lifetime Detector 1 (start) TAC delay Detector 2 (stop) Time /ps Faye Rowntree 9 24/04/2025
feeder Fast Timing feeder feeder State of interest decay decay decay feeder Detector 1 (start) Counts TAC delay decay antidelayed antidelayed Detector 2 (stop) delayed delayed decay Detector 1 (start) TAC delay feeder Detector 2 (stop) Time /ps Faye Rowntree 10 24/04/2025
Convolution Method gaussian -ray energy decay constant decay constant exponential centroid background count background count Faye Rowntree 11 24/04/2025
Background Subtraction p|bg bg|bg p|p bg|p E. Gamba, Thesis (2019) Faye Rowntree 12 24/04/2025
146Ba 2+ half-life 1 1- - 2 2+ +, , 2 2+ + 0 0+ + 4 4+ + 2 2+ +, , 2 2+ + 0 0+ + 1 1- - 2 2+ +, , 2 2+ + 0 0+ + t t1/2 1/2 = = 862(4) 862(4) ps ps 4 4+ + 2 2+ +, , 2 2+ + 0 0+ + From literature: 859(29) ps H. Mach et al, Phys. Rev. C41 41 R2469 (1990) NNDC Faye Rowntree 14 24/04/2025
148Ce 2+ half-life 4 4+ + 2 2+ +, , 2 2+ + 0 0+ + t t1/2 1/2 = 1050 +/ = 1050 +/- - 9 9 ps ps 1 1- - 2 2+ +, , 2 2+ + 0 0+ + NNDC From literature: 1010 +/- 60 ps R. L. Gill et. al, Phys. Rev. C 33 33, 1030 (1986) Faye Rowntree 15 24/04/2025
3 3- - 2 2+ +, , 2 2+ + 0 0+ + 146Ce 2+ half-life t t1/2 1/2 = = 204(3) 204(3) ps ps 4 4+ + 2 2+ +, , 2 2+ + 0 0+ + 1 1- - 2 2+ +, , 2 2+ + 0 0+ + NNDC From literature: 189(10) ps H. Mach et. al, Nuclear Instruments and Methods in Phys A 280 280 (1989) Faye Rowntree 16 24/04/2025
Summary of B(E2)s Nuclide Nuclide Half Half- -life / 862(4) 204(3) 1057(10) life /ps ps Lifetime / Lifetime /ps 1244(6) 294(3) 1526(14) ps B(E2) /e B(E2) /e2 2fm 3386(17) 2417(25) 5375(50) fm4 4 146Ba 146Ce 148Ce Faye Rowntree 17 24/04/2025
Future Work: 1- and 3- Lifetimes ZDS (start) feeder feeder TAC feeder delay State of interest LaBr3(Ce) (stop) decay decay decay HPGe+ Faye Rowntree 18 24/04/2025
Future Work: 146Ba Counts 307 keV, 3- 4+ 332 keV, 4+ 2+ 557 keV, 1- 2+ 640 keV, 3- 2+ Energy /keV Faye Rowntree 19 24/04/2025
Future Work: 146Ce Counts 292 keV, 3- 4+ 410 keV, 4+ 2+ 666 keV, 1- 2+ 640 keV, 3- 2+ Energy /keV Faye Rowntree 20 24/04/2025
Thank you to my collaborators L. Gaffney1 J. Ojala1 M. M. Satrazani1 P. Spagnoletti1 F. Ali2 C. Andreoiu3 N. Bernier4,5 M. Bowry4 S. S. Bhattacharjee4 R. Cabellero-Folch4 R. Coleman2 A. Diaz Varela2 F. H. Garcia3 A. B. Garnsworthy4 G. Grinyer6 M. P. Hladun6 J. Keatings7 R. Lefleur2 B. K. Luna8 K. Mashtakov7 J. L. Mitchell6 B. C. Olaizola Mampaso4 C. Petrache9 A. J. Radich2 M. M. Rajabali8 Y. Saito4,5 L. Sexton4,10 J. P. Siuryte4,10 J. Smallcombe4 J. F. Smith7 C. Svensson2 E. Timakova4 K. Whitmore3 D. Yates4,5 1 1 University of Liverpool, Liverpool, UK 2 2 University of Guelph, Guelph, Canada 3 3 Simon Fraser University, Vancouver, Canada 4 4 TRIUMF, University of British Columbia, Vancouver, Canada 5 5 University of British Columbia, Vancouver, Canada 6 6 University of Regina, Regina, Canada 7 7 University of the West of Scotland, Glasgow, UK 8 8 Tennessee Technological University, Cookeville, Tennessee, USA 9 9 Paris-Saclay University, Paris, France 10 10 University of Surrey, Guildford, UK Faye Rowntree 21 24/04/2025
